Where does “cũng nên” come from?

cũng nên (Vietnamese) comes from Vietnamese nên, from Dutch neen, from Middle Dutch neen, from Old Dutch nēn, from Old Dutch ne, from Proto-Germanic nē, from Proto-Germanic aiwaz, from Proto-Indo-European h₂eyu- — vital force, life, age, eternity; day, morning.

cũng nên (Vietnamese): Added at the ending of a statement to express assumption with a little affirmation: perhaps

Definitions

  1. Added at the ending of a statement to express assumption with a little affirmation: perhaps

Ancestry of “cũng nên”, step by step

cũng nên traces back through two separate lines of ancestry.

via Vietnamese nên

StepLanguageWordMeaning
1Vietnamesenênto develop into; to change into; should; ought...
2Dutchneenno; stressed or formal form of nee
3Middle Dutchneen
4Old Dutchnēnnone, not one
5Old Dutchnenot
6Proto-Germanicnot
7Proto-Germanicaiwazlong time, age, eternity
8Proto-Indo-Europeanh₂eyu-vitality; eternal; vital force, life, long life,...
9Proto-Indo-Europeanh₂ey-vital force, life, age, eternity; day, morning

via Vietnamese cùng

StepLanguageWordMeaning
1Vietnamesecùngthe end, limit; with; and
2Middle Chinese
Every word from Proto-Indo-European h₂ey-